// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/renderer/pepper/audio_helper.h"

#include "base/logging.h"
#include "content/common/pepper_file_util.h"
#include "ppapi/c/pp_completion_callback.h"
#include "ppapi/c/pp_errors.h"

using ppapi::TrackedCallback;

namespace content {

// AudioHelper -----------------------------------------------------------------

AudioHelper::AudioHelper()
    : shared_memory_size_for_create_callback_(0)
{
}

AudioHelper::~AudioHelper() { }

int32_t AudioHelper::GetSyncSocketImpl(int* sync_socket)
{
    if (socket_for_create_callback_) {
        *sync_socket = IntegerFromSyncSocketHandle(
            socket_for_create_callback_->handle());
        return PP_OK;
    }
    return PP_ERROR_FAILED;
}

int32_t AudioHelper::GetSharedMemoryImpl(base::SharedMemory** shm,
    uint32_t* shm_size)
{
    if (shared_memory_for_create_callback_) {
        *shm = shared_memory_for_create_callback_.get();
        *shm_size = shared_memory_size_for_create_callback_;
        return PP_OK;
    }
    return PP_ERROR_FAILED;
}

void AudioHelper::StreamCreated(base::SharedMemoryHandle shared_memory_handle,
    size_t shared_memory_size,
    base::SyncSocket::Handle socket_handle)
{
    if (TrackedCallback::IsPending(create_callback_)) {
        // Trusted side of proxy can specify a callback to receive handles. In
        // this case we don't need to map any data or start the thread since it
        // will be handled by the proxy.
        shared_memory_for_create_callback_.reset(
            new base::SharedMemory(shared_memory_handle, false));
        shared_memory_size_for_create_callback_ = shared_memory_size;
        socket_for_create_callback_.reset(new base::SyncSocket(socket_handle));

        create_callback_->Run(PP_OK);

        // It might be nice to close the handles here to free up some system
        // resources, but we can't since there's a race condition. The handles must
        // be valid until they're sent over IPC, which is done from the I/O thread
        // which will often get done after this code executes. We could do
        // something more elaborate like an ACK from the plugin or post a task to
        // the I/O thread and back, but this extra complexity doesn't seem worth it
        // just to clean up these handles faster.
    } else {
        OnSetStreamInfo(shared_memory_handle, shared_memory_size, socket_handle);
    }
}

void AudioHelper::SetCreateCallback(
    scoped_refptr<ppapi::TrackedCallback> create_callback)
{
    DCHECK(!TrackedCallback::IsPending(create_callback_));
    create_callback_ = create_callback;
}

} // namespace content
